{"id":442,"date":"2026-06-12T18:28:47","date_gmt":"2026-06-12T22:28:47","guid":{"rendered":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2018-ram-2500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide\/"},"modified":"2026-06-12T18:28:47","modified_gmt":"2026-06-12T22:28:47","slug":"2018-ram-2500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide","status":"publish","type":"post","link":"https:\/\/www.worldsbestdieseloil.com\/oil-guide\/2018-ram-2500-pickup-6-7l-6-cyl-diesel-turbo-maintenance-guide\/","title":{"rendered":"2018 Ram 2500 6.7L Diesel Oil Guide: Capacity, Viscosity & Filters"},"content":{"rendered":"
\n
\n
\"AMSOIL
AMSOIL diesel oil guide for trucks, vans, SUVs and diesel engines<\/figcaption><\/figure>\n

For the 2018 Ram 2500 Pickup with the 6.7L 6-Cylinder Diesel engine (Engine Code L), the oil capacity is 12 quarts<\/strong> with a filter change. The recommended viscosity is 15W-40<\/strong> for ambient temperatures above -18\u00b0C, or 5W-40<\/strong> synthetic oil for temperatures below -18\u00b0C to prevent severe engine damage. AMSOIL recommends using the Signature Series 5W-40 Max-Duty Diesel Oil<\/a> paired with an AMSOIL or WIX oil filter<\/a>.<\/p>\n

What oil does a 2018 Ram 2500 6.7L Diesel take?<\/h2>\n

The 2018 Ram 2500 with the 6.7L diesel engine requires an API CJ\/CK-4 grade oil that meets MS-10902 specifications. For temperatures above -18\u00b0C (0\u00b0F), a 15W-40 viscosity is appropriate. However, if you operate in ambient temperatures below -18\u00b0C, you must use SAE 5W-40 synthetic engine oil to avoid severe engine damage.<\/p>\n

AMSOIL product recommendations<\/h2>\n

Based on the vehicle lookup for the 2018 Ram 2500 6.7L Diesel, the following high-performance fluids and filters are recommended to maintain engine health and meet required specifications.<\/p>\n

Engine Oil Options<\/h3>\n
\n\n\n\n\n
Product Name<\/th>\nViscosity<\/th>\nCode<\/th>\n<\/tr>\n
Signature Series 5W-40 Max-Duty Diesel Oil<\/a><\/td>\n5W-40 \/ 15W-40<\/a><\/td>\nDEOQT-EA<\/a><\/td>\n<\/tr>\n
5W-40 Heavy-Duty 100% Synthetic Diesel Oil<\/a><\/td>\n5W-40 \/ 15W-40<\/a><\/td>\nADOQT-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Oil Specification Note:<\/strong> The AMSOIL lookup note requires API CJ\/CK-4 oil meeting MS-10902. Oil meeting Cummins CES 20081 standards may also be used. Low ash diesel engine oil is required.<\/p>\n

Oil Filter Options<\/h3>\n
\n\n\n\n\n\n
Product Name<\/th>\nCode<\/th>\n<\/tr>\n
AMSOIL Oil Filter<\/a><\/td>\nEAO80-EA<\/a><\/td>\n<\/tr>\n
WIX XP Oil Filter<\/a><\/td>\n57620XP-EA<\/a><\/td>\n<\/tr>\n
WIX Oil Filter<\/a><\/td>\n57620-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Coolant & Air Filtration<\/h3>\n
\n\n\n\n\n\n
Component<\/th>\nProduct Name<\/th>\nCode<\/th>\n<\/tr>\n
Coolant<\/td>\nPassenger Car & Light Truck Antifreeze<\/a><\/td>\nANTPC1G-EA<\/a><\/td>\n<\/tr>\n
Coolant<\/td>\nPropylene Glycol Antifreeze<\/a><\/td>\nANT1G-EA<\/a><\/td>\n<\/tr>\n
Air Filter<\/td>\nWIX Air Filter<\/a><\/td>\n46930-EA<\/a><\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Engine Oil Specifications<\/h3>\n
\n\n\n\n\n\n\n\n
Parameter<\/th>\nSpecification\/Value<\/th>\n<\/tr>\n
Oil Grade (AMSOIL lookup)<\/td>\nSEO39<\/td>\n<\/tr>\n
Viscosity (Above -18\u00b0C)<\/td>\n15W-40<\/td>\n<\/tr>\n
Viscosity (Below -18\u00b0C)<\/td>\n5W-40 (Synthetic Required)<\/td>\n<\/tr>\n
API Specification<\/td>\nCJ\/CK-4<\/td>\n<\/tr>\n
OEM Standards<\/td>\nMS-10902 or Cummins CES 20081<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

How much oil does it take with a filter change?<\/h2>\n

The total capacity for the 6.7L diesel engine is 12 quarts<\/strong> when performing an oil change with a new filter installed. It is critical to follow proper filling procedures to ensure accurate levels.<\/p>\n

Oil Change Capacity & Torque<\/h3>\n
\n\n\n\n\n
Detail<\/th>\nSpecification<\/th>\n<\/tr>\n
Capacity (with filter)<\/td>\n12 quarts<\/td>\n<\/tr>\n
Oil Drain Plug Torque<\/td>\n37 ft\/lbs<\/td>\n<\/tr>\n<\/table>\n<\/div>\n

Maintenance Tip:<\/strong> After filling, start the engine and let it idle for several minutes. Check for leaks, then stop the engine. Wait 30 minutes to allow the oil to drain back into the pan before checking the level again.<\/p>\n

Diesel maintenance notes for this vehicle<\/h2>\n